/**
 * \* Created with IntelliJ IDEA.
 * \* User: 冯若航
 * \* Date: 2021/5/18
 * \* Time: 21:07
 * \* To change this template use File | Settings | File Templates.
 * \* Description:
 * \
 */
public class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;
    TreeNode(int val){
        this.val=val;
    }
    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}